Blower



Nov.v 30, 1943. T. J. MORGAN ETAL 2,335,437

BLOWER Original Filed April l5, 194() Vw q f 1 m, f 50./ 1 2g ,il 5f/5f f@ f f UHD Illu 1 M5 50. 3

Patented Nov. 30, 1943l Lil-f FFH@ i' 2,335,437 BLOWER Thomas J. Morgan, Chicago, and Arthur S. Dearborn, Hinsdale, IlL, assignors to Ampro Corpof ration, a corporation o! Illinois Original application April 15, 1940, Serial No. 329,784. Divided and this application July 21,

194i, Serial No. 403,370

7 Claims.

This invention relates to blowers more especially designed for use with cinematographs. This application is a division of copending application SerfNo. 329,784 iiled April i5, 1940.

The main objects of this invention are to provide an improved form and construction ci a blower particularly suitable for cooling thosel parts of a. cinematograph which are normally subjected to considerable heat emanating from the source of illumination employed in the device, and also from the driving motoryand to provide a blower which will operate with equal efliciency regardless of the direction oi rotation of the impeller or fan member. The other objects and advantages of the invention will be understood by reference to the following specification and the accompanying drawing wherein there is described and shown a blower embodying the selected form oi the in vention. In the embodiment as herein shown in they drawing:

Fig. 1 is a transverse cross sectional view of the improved form of blower incorporated in the casing of a cinematograph adjacent to the lamp.

Fig. 2 is a similar sectional view corresponding to Fig. 1 showingv the shiftable vane in the opposite position; and

Fig. 3 is a sectional view taken on the line 3-3 of Flg. 1.

In the construction herein shown, the blower housing 50 has mounted therein an impeller or ian member |35 with which two parts is associated a vane |41 automatically shiftable circumerentially-of the fan for altering the form and direction of the spiral contour of the air exit ,passage from the blower. In practice these parts are all designed and formed in accordance with the best principles oi turbine Ian design.

The blower housing 50 as herein shown is an integral part of that portion of a cinematograph casing 49 which encloses a lamp |09. The circumferential contour of this blower housing 50 is in the form of two scrolls 50.| and 50.2 oi conventlonal contour which are Joined at 50.3. Thus shaped, the housing, coacting with the shiftable vane |41, as will be more clearly hereinafter explained, provides an air exit from the blower at either the upper or lower inner and open side of the housing 50 as indicated by the arrows in Figs. 1 and 2.

The impeller or fan |35 is of conventional turbine type and is mounted on a shaft |35 of .a motor 5|. A plate |31 provides support for the blades and closes the outer end oi the ian member. A hub member i3d on the pia 31 provides support or the ian 35 on the shaft |35. The inner end inwardly'il of the blades is open Wherethrough air is drawn axially and then discharged'radially into the area between the fan and the housing 50. Kben the blower is applied to a cinematograph housing, the air is admitted through the clnematograph casing openings |4|, |42, and |43, as indicated by the arrows Y' in Fig. 3.

The shiitable vane |41 is in the form of an arcuate member circumferentially arranged with respect to the fan and pivotally supported on an axis eccentric to that of the ian |41 so that in either of its positions the arcuate member complements the curvature of the scrolls 50.| and 50.2. Thus with the vane in one position, the spiral outlet passage is narrow or restricted at |44 and gradually enlarges toward the outlet |45. With the vane in the reverse position, the spiral outlet passage is narrow or restricted at |55 and gradually enlarges toward thevoutlet |56.

To effect these results, the vane |41 is carried by radially disposed arms or plugs |48 mounted on a stud shaft |50 which is supported eccentrically of the vane shaft |38. A counterbalance v |52 for the vane |41 is secured thereto by means of a third radial arm |5|. The proportions of this counterweight |52 are such that it will eiectively coact with the air pressure produced by the ian |35 to aid in the automatic shifting of the vane into one or the other of its positions as shown in Figs. 1 and 2, depending upon the direction of rotation of the fan |35.

The ends of the vane are curled at |53 to 'pro-I vide shoulders adapted for abutment against a pin |54 attached to the housing 50 so as to be located in the path of the shoulders. As the'vane shifts from one of its positions to the other the shoulders |53 engage the pin |54 and thus limit the movement of the'vane.

A blower structure of this character insures an effective air discharge regardless of the direction of rotation of the i'an. The reversing of the fan results in an automatic and immediate reversal of the spiral contour for the surrounding air-exit channel occasioned by the shifting of the vane from one to the other of its positions. This maintenance o1' an effective flow of air regardless of' the direction of rotation of the fan is highly important, particularly when the blower is used with cinematographs of the reversible type. In such cases, regardless of the direction of rotation of the nlm feeding mechanism, the

lamp and other heat-creating means in the cinematograph are continually subjected to a cooling air current.

We claim:

1. A blower comprising a housing. a reversiblefan rotatably mounted in said housing, and a vane circumferentially shiitable between opposite positions for alternating the spiral contour of the outlet passage in said housing.

2. A blower comprising a housing, a reversible fan rotatably mounted in said housing, anda vane mounted on an axis eccentric of the axis of said blower and circumferentially shiftable between opposite positions for alternating the spiral contour of the outlet passage in said housing 3. A blower comprising a housing, a reversible fan rotatably mounted in said housing, a vane circumferentially shiftable between opposite positions for alternating the spiral contour of the outlet passage in said housing, and coacting shoulders on said vane and housing for limiting the reversible circumferential movement of said vane.

4. A blower comprising a housing, a reversible fan rotatably mounted in said housing, a vane circumierentially shitable between opposite positions for alternating the spiral contour of the outlet passage in said housing, shoulders on the end of said vane, and a pin on said housing extending 'into the path of said shoulders and adapted to be engaged by one or the other for limiting the circumferential movement of said varie in one or the other of its directions.

5. A blower comprising a housing, a reversible ian rotatably mounted in said housing, and a vane in the form of an arcuate member onset tromaradialextensionsoastobedisposedin the plane ot rotation of said ran, said radial extension being mountedv eccentrically of said Ian axis to permit the circumferential shifting of said member between opposite positions for alternating the spiral contour of the outlet passage in said housing.

6. A blower comprising a housing, a reversible fan rotatably mounted in said housing, a vane in the form of an arcuate member odset from a radial extension so as t be disposed in the plane of rotation of said fan, said radial extension being mounted eccentrically of said fan axisto permit the circumferential shifting of said member between opposite positions for altemat'- ing the spiral contour of the outlet passage in said housing, and a counterweight carried by said vane extension and coacting with the discharge from said fan for positioning said van in the one or the other of its positions.

7. A blower comprising a housing the circumferential walls of which are formed by the union of two oppositely disposed scrolls, a fan rotatably mounted in said housing, a vane circumferentially positioned in the plane of rotation of said fan and eccentrically mounted relative to the axis thereof, saidvane being circumferentially shiftable between opposite positions whereby in one or the other of its positions it forms a continuation of one or the other of -said housing scrolls and thereby alternating the spiral contour of the outlet passage of said housing.

THOMAS J. MORGAN. ARTHUR S. DEARBORN. 

